i need help factoring

i need help factoring

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If the equation is to factor 10x^2-21, the negative sign will allow you to not include the addition sign which will cause the problem to look as I have put above.

This equation is non-factorable.

There are no numbers that can multiply evenly into 10 and 21 in order to factor out a greatest common factor for starting.

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## Comments

is it a binomial 10x^2 + (-21)?? the plus minus signs confusing